/*
 * Copyright © 2019 Apple Inc. and the ServiceTalk project authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.servicetalk.http.api;

import io.servicetalk.buffer.api.Buffer;

final class BufferUtils {

    private BufferUtils() {
        // No instances
    }

    static void writeReadOnlyBuffer(final Buffer readOnly, final Buffer dst) {
        // Use readOnly.getBytes instead of dst.writeBytes to utilize internal optimizations of ReadOnlyByteBuffer
        final int dstIndex = dst.writerIndex();
        final int length = readOnly.readableBytes();
        readOnly.getBytes(readOnly.readerIndex(), dst, dstIndex, length);
        dst.writerIndex(dstIndex + length);
    }
}
